To use cross site scripting, the user would have to exploit it. Being that your on the latest version of Windows XP, you are more secure than most. However, ALL-AROUND Security is important to prevent from future exploits and virus. To do this I would recommend the following programs to use with XP SP2. One of the best defenses against exploits, is research. Check out the programs and sites I list below, This will help get you on the right track in securing your system.

Antivirus:
Kaspersky Antivirus 5.0 (new version) http://www.kaspersky.com/personal
This program is the best by far. It updates every 3 hours, scans web browser scripts also.
I've tested many other virus scanners through the years and this is by far the best.

Spyware/Adware/Malware/Dataware:
AD-AWARE - www.lavasoftusa.com
If you can afford it by the PRO version, the extra feature AD-WATCH is well worth it for it monitors your registry and notifies you of any changes made allowing you to ALLOW or REJECT the request on the fly.

BHO Demon - www.majorgeeks.com/download3550.html (mirrored)
This is a must now-a-days if your running Internet Explorer! BHO is used in a lot of the recent IE exploits as well as keyloggers. Windows XP SP2 offers something along these lines, but why trust M$.

IDS ( Intrusion Detection System ): - snort.org
I was reading my Windows & .NET Magazine, and it has a great article on SNORT. Setting it up and everything. Page 51! Or you can buy the book SNORT 2.1 Second Edition. This program is absolutly promising, this is for extreme paranoid users & advanced users.

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